The classification of the regulator mainly the actuators, electric regulating valve and pneumatic control valve. And according to the structure to the main can be divided into: single seater, sleeve, two-seat type, cage and so on four kind of structure. Regulating valve main types are divided into: tee, Angle type, high temperature, low temperature type, bellows type as several types. Electric control valve and pneumatic - valve functions respectively as follows: electric regulator is by regulating the body of electric actuators with different industrial field instrument, it takes 4 - regulator output 20 ma or pulse signal, for closed loop control, realize the parameters such as flow, pressure, temperature, liquid level automatic control, and can choose a kind of intelligent electric actuator, realize digital transmission, such as DCS, PLC, more intelligent control system. Electric regulator power supply voltage is 220 v and 380 v, two kinds of electric control valve flow characteristics such as percentage, such as linear and fast 3 kinds. Electric control valve compared with pneumatic control valve, energy saving, Only electricity when at work) , environmental protection, No carbon emissions) Fast installation, convenient, No need for complicated pneumatic pipe and pump stations) And other advantages, widely used in electric power, chemical industry, metallurgy, environmental protection, water treatment, light industry, building materials, such as industrial automation systems. Pneumatic control valve pneumatic diaphragm regulating valves and pneumatic piston valve, it was based on the compressed air as power source, the diaphragm or piston cylinder as actuator, and by means of electric valve positioner, converters, solenoid Industrial Valves, a valve to drive the valve such as attachment, realize the switch quantity or proportion type adjustment, industrial automation control system receives the control signal to complete regulating the flow of pipeline medium, pressure, temperature and other process parameters. Pneumatic control valve is to control the characteristics of simple, quick response, and intrinsically safe, do not need another explosion protection measures. Pneumatic regulator is also relative to the cost of electric control Industrial Valves, lower in chemical, petrochemical and other fields, pneumatic control valve with electric regulator incomparable advantages. Regulator is the main characteristics and applications were as follows: single-seat regulating valve is mainly used to allow the leakage is usually not a small pressure difference of the workplace. Sleeve valve USES the balanced valve core, unbalanced force big, allow the pressure difference is big, stable operation. Cage control valve is particularly suited to allow small pressure difference, pressure difference before and after the valve larger workplace. Two-seater regulator, especially used in pressure difference is bigger and not strict with leak amount clean medium occasion. Three-way valve: confluence model is mainly used for mixing two kinds of fluid into the third fluid; FenLiuXing is mainly used for a fluid can be divided into two strands of fluid. Angle regulator is especially suitable for high viscosity, containing suspended solids and granular the adjustment of the dielectric fluid, can avoid coking, adhesion, jams. High temperature regulator is applicable to large flow, high temperature, leakage is not strictly required. Low temperature type valve is suitable for below 0 ~ - Work under 250 ℃ condition. Bellows type regulator is applicable to a literacy is volatile, flammable and explosive and the adjustment of the rare and precious metal medium.
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